FX Artist Needed (Particular)

Hey guys, I have created a Harry Potter fan film back in 09.
Have been working on a sequel for two years and need some help. All VFX are complete except for about 5 shots which require death eater smoke trails. I'm not that VFX skilled to understand how to pull it off correctly so I'm coming here for help. These shots are not very lengthy. Each range between 2-10 seconds. Any takers?